Working Group on Transient Flows
Vision, scopes and research focuses
Our aim is to provide with a framework to the transient group community within IAHR association. To the date, there are no other international research associations with a specific representation to hydraulic transients. Eventually, our vision is to organize individual IAHR symposiums or conferences on transients and start to have a sub-theme or a theme on transient in future IAHR congress.
The main focus areas of the working group include:
Transient waves theory in hydro-systems
Hydro-system diagnosis by means of transient waves
Waves-structure interaction in hydro-systems
Geysers in storm-water and combined sewer systems
Computational transient flows modeling (in closed or opened conduit flows)
Transient-turbulent flows (in closed or opened conduit flows)
Field works: case studies, practical applications and projects
Background
Hydraulic transient is known as the rapidly changing flow inducing pressure waves in closed conduits or open channel systems. This engineering field, which is important for system design and recently found to be valuable for system diagnosis, is being studied by over 500 researchers around the world. In fact, the records show that the 2nd most submissions of papers to the Journal of Hydraulic Research (JHR) are in the topic of hydraulic transients (after sediment transport). Unfortunately, none of the current IAHR conferences/symposiums are dedicated to such field, and there has never been a theme or sub-theme on transient flows in past IAHR congresses.
Prof Silvia Meniconi and Prof Moez Louati organized two successful sessions on transient in pipes in IAHR congress in 2017 (KL) and 2019 (Panama). These two special sessions had over 40 participants and included keynote lectures from top professors in hydraulic transients (including Prof. Bryan Karney, Prof. Hanif M. Chaudhry, Prof. Jim Liou, Prof. Bruno Brunone, Prof. Mohamed S. Ghidaoui). This marked a clear indication that there is an interest for a special theme on transient flows that could bring the transient community together within IAHR. Consequently, a request for a working group on transient flows was proposed and accepted in April 2020 to be held under the technical committee on fluid mechanics.
Building on this momentum, additional dedicated sessions were hosted in Granada (2022) and Vienna (2023). Each attracted more than 50 participants, and featured insightful keynote lectures by experts such as Arris Tjsseling, Hanif Chaudhry, and Bruno Brunone.
Figure 1 Prof. Bryan Karney during his keynote lecture in the 38th IAHR World congress, Panama
Figure 2 A good selection of the transient group during the galla dinner of the 38th IAHR World congress, Panama
Figure 3-7 additional dedicated sessions were hosted in Granada (2022) and Vienna (2023)
Annual report
Activities
Upcoming activities:
8th IAHR Europe Congress | Special session on transient flows
4-7 June 2024, Lisbon (Portugal)
Given the success of the special sessions organized by the Working Group at past IAHR World Congresses, we are now keen to expand this initiative to regional congresses. The organizing committee has accepted a special session for the 8th European Congress on Transient Flows, where seven papers will be presented.
Thematic symposium on transient flows
Date to be determined
The Working Group on Transient Flows would like to launch the 1st Thematic Symposium on Transient Flows. The Symposium is expected to be held during late 2024 or early 2025. Right now, we are at the bidding process stage and currently collecting expressions of interest.
IAHR Monograph on transient flows
Date to be determined
As a result of the online course on transient flows, the working group is now working on the writing of an IAHR monograph. This monograph will include much of the course contents, which were presented by top researchers in the field covering the entire spectrum of transient flows. We expect to come up with a first monograph draft during early 2024.
Past activities:
IAHR online short course: Perspectives on Two-phase Flows in Urban Water Systems, 8 to 10 May 2023
Establishing and chairing the sub-theme 3c on "Transient flows and pipeline hydraulics" , 39th IAHR World congress, 19-24 June 2022, Granada, Spain.
A session on Challenges in Transient Flows at the 1st IAHR online forum (July, 5th 2021 at 10am UTC) | Slides
IAHR Short Course on Transient Flows, November 2021, Online
Organizing the 1st special session on Transients in pipes, 37th IAHR World congress, KL-Malaysia, 13-18 August 2017.
Organizing the 2nd special session on Transients in pipes, 38th IAHR World congress, Panama city-Panama, 1 and 6 September 2019.
IAHR online short course: Perspectives on Two-phase Flows in Urban Water Systems, 8 to 10 May 2023
Online Panel Session on "Damping". The purpose of this Session would be to alert people to the many possible causes of so-called damping of pressure signals in transient flows in pipes and pipe networks
Resources and links
Contact
For any inquiry about the Working Group on Transient Flows, please send an email to TFWG.IAHR@gmail.com.